[Xymon] Administratrivia: Problems for yahoo.com mailing list subscribers

[Henrik Størner]

Hi,

Yahoo has an annoying habit of making life difficult for mail admins,
and they  have recently done so again by enabling a DMARC 'reject'
policy for all of their subscribers. DMARC is one of the newer tools to
combat spam, but it has the unfortunate side effect of being completely
incompatible with most mailing list software. This came to my attention
this morning, when most of the yahoo subscribers to the mailing list
were disabled.

http://yahoomail.tumblr.com/post/82426900353/yahoo-dmarc-policy-change-what-should-senders-do
http://wiki.list.org/display/DEV/DMARC

I have this morning upgraded the Mailman software used on the Xymon
mailing list. The effect of this is that mails from Yahoo adresses (and
others, who has set DMARC policy to 'reject' or 'quarantine') will be
wrapped in an "outer message" when forwarded to the list. Most of you
won't notice, but it depends on how your e-mail client handles such
messages.


Regards,
Henrik